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Verification Involving PSTN Reachability: Requirements and Architecture Overview

Document Type Expired Internet-Draft (individual)
Expired & archived
Authors Mary Barnes , Cullen Fluffy Jennings , Jonathan Rosenberg , Marc Petit-Huguenin
Last updated 2014-06-12 (Latest revision 2013-12-09)
RFC stream (None)
Stream Stream state (No stream defined)
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RFC Editor Note (None)
IESG IESG state Expired
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft is available in these formats:


The Session Initiation Protocol (SIP) has seen widespread deployment within individual domains, typically supporting voice and video communications. Though it was designed from the outset to support inter-domain federation over the public Internet, such federation has not materialized. The primary reasons for this are the complexities of inter-domain phone number routing and concerns over security. This document reviews this problem space, outlines requirements, and then describes a model and technique for inter-domain federation with SIP involving the Public Switched Telephone Network (PSTN), called Verification Involving PSTN Reachability (VIPR). VIPR addresses the problems that have prevented inter-domain federation over the Internet. It provides fully distributed inter-domain routing for phone numbers, authorized mappings from phone numbers to domains, a new technique for automated SIP anti-spam, and privacy of number ownership, all while preserving the trapezoidal model of SIP.


Mary Barnes
Cullen Fluffy Jennings
Jonathan Rosenberg
Marc Petit-Huguenin

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)